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Andreaea
''Andreaea'' is a genus of rock mosses described by Johann Hedwig in 1801. They are small, delicate acrocarpous mosses (meaning that the capsules are formed at the tips of vertical branches) that form dark brown or reddish cushions on wet siliceous rocks in mountainous areas. The capsule lacks the peristome teeth and operculum of other mosses, and opens by splitting along 4 vertical slits, the four valves remaining joined at the base and apex. The capsule of ''Andreaea'' has no seta, but the sporophyte (''Spf'' in the diagram below) instead is supported by a pseudopodium (''ps'') derived from gametophyte tissue, as in ''Sphagnum'' and the columella is enclosed within the sporangium. The spores germinate to give thalloid Thallus (plural: thalli), from Latinized Ancient Greek, Greek (), meaning "a green shoot" or "twig", is the vegetative tissue of some organisms in diverse groups such as algae, fungi, some Marchantiophyta, liverworts, lichens, and the Myxogastr ... proton ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andreaea Angustata
''Andreaea'' is a genus of rock mosses described by Johann Hedwig in 1801. They are small, delicate acrocarpous mosses (meaning that the capsules are formed at the tips of vertical branches) that form dark brown or reddish cushions on wet siliceous rocks in mountainous areas. The capsule lacks the peristome teeth and operculum of other mosses, and opens by splitting along 4 vertical slits, the four valves remaining joined at the base and apex. The capsule of ''Andreaea'' has no seta, but the sporophyte (''Spf'' in the diagram below) instead is supported by a pseudopodium (''ps'') derived from gametophyte tissue, as in ''Sphagnum'' and the columella is enclosed within the sporangium A sporangium (; from Late Latin, ) is an enclosure in which spores are formed. It can be composed of a single cell or can be multicellular. Virtually all plants, fungi, and many other lineages form sporangia at some point in their life cy .... The spores germinate to give thalloid protone ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
